The CPO technology debate is over; the race is now about yield, test and delivery. With SCALE, GlobalFoundries turns the optical engine into a fully tested semiconductor part built to last a decade, targeting 20–30% of pluggable cost. The real variable isn't optics — it's interoperability standards that have yet to converge.

At OCP, ASE laid out CPO's three-step energy-efficiency math and delivered the most honest line of the event: almost nobody is talking about optical engine yield testing. CPO's technology debate is over; the yield debate has begun. The next signal to watch is not who announces more Tbps, but who first publishes KGOE test yield.

Pluggable optics are hitting the front-panel limit, not a speed limit. Andy Bechtolsheim sandwiches a cold plate between two paddle cards to shrink 102.4T from 4U to 1U. His only doubt about CPO is attach yield, not the physics, and a Foxconn connector now sampling decides whether XPO works at 400G/lane.